test: expand test suite to 74 images with libtiff reference decoder

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Add 19 new libtiff-generated test images and a reference decoder
(verify_seq_tiff.c) that independently verifies all checksums using
libtiff's own read path, giving three-way agreement:
  libtiff writer → libtiff reader → image-tiff reader

New coverage:
- Standard sub-byte: 1-bit, 2-bit, 4-bit grayscale (BIZ + WIZ)
- Multi-strip: RowsPerStrip=4 (gray 8/16, RGB 8)
- Tiled + compressed: LZW and Deflate tiles
- Float predictor: f32/f64 + Deflate + predictor=3
- Unassociated alpha: RGBA 8-bit with EXTRASAMPLE_UNASSALPHA
- Sub-byte RGB: 5-bit and 7-bit contiguous
- Signed RGB: i8 and i16 (3-channel, decoded as Multiband)
- Float f64 RGB
- Tiled BigTIFF

verify_seq_tiff.c: reads each TIFF with libtiff, computes matching
checksums (handling packed sub-byte, unpacked extended, float, signed),
and verifies 68/68 cases pass.

Total: 74 test images (66.8 KB), 317 tests all passing.

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This commit is contained in:

Lilith River committed 2026-03-10 06:02:19 -06:00

1 parent a4cbf7bbaf

commit c3977c4513

22 files changed

+952

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tests/images/seq-1c-16b-multistrip.tiff

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tests/images/seq-1c-1b-miniswhite.tiff

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tests/images/seq-1c-1b.tiff

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tests/images/seq-1c-2b.tiff

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tests/images/seq-1c-32f-deflate-fpredict.tiff

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tests/images/seq-1c-4b-miniswhite.tiff

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tests/images/seq-1c-64f-deflate-fpredict.tiff

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tests/images/seq-1c-8b-multistrip.tiff

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tests/images/seq-1c-8b-tiled-bigtiff.tiff

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tests/images/seq-1c-8b-tiled-deflate.tiff

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tests/images/seq-1c-8b-tiled-lzw.tiff

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tests/images/seq-3c-64f.tiff

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tests/images/seq-3c-8b-multistrip.tiff

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tests/images/seq-3c-i16.tiff

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tests/images/seq-4c-8b-rgba-unassoc.tiff

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